Failed to stop packet capture on the VirtualNetworkGateway Error: An internal error occured. The response did not contain any data. Please check storage for the capture.

Question

Hi,

I'm trying to troubleshoot an issue with phase 2 traffic selector for a Azure VPN. I want to take a VPN packet capture but when I stop it, it fails with following message:

Failed to stop packet capture on the VirtualNetworkGateway '<name of the GW>'. Error: An internal error occured. The response did not contain any data. Please check storage for the capture.

I checked the storage account but no capture is present. The used SKU is VpnGw2 and it's a route based VPN.

Anyone knows why this VPN packet capture is not possible? Thanks.

Answer 1

@Robben Aerts If the error message mentions the error is due to the SasUrl, then it may be related. Please make sure that you get the SasUrl using the following command:

$sasurl = New-AzureStorageContainerSASToken -Name $containerName -Context $context -Permission "rwd" -StartTime $now.AddHours(-1) -ExpiryTime $now.AddDays(1) -FullUri

You can also do the same via the Portal as shown below:

Hope this helps. Please let us know if you have any further questions and we will be glad to assist you further. Thank you!

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Answer 2

Hi,

I just like to understand the error message. Is it because the VPN has an issue and is not up that we get this?
I wanted to use this packet capture to see the negotiation of the VPN tunnel between the peers because there are not much debug possibilities or logging to find the cause that the tunnel is not coming up. But maybe the VPN packet capture doesn't contain this data and therefore it's empty?